@misc{an+investigation+of+the+approximation+of+functions+of+two+variables+by+the+poisson+integral+for+hermite+expansions,
    author = {Krech, Grażyna},
    title = {An investigation of the approximation of functions of two variables by the Poisson integral for Hermite expansions},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2014},
    number = {Y. 111, iss. 3-NP}
}